Comms 3 Flashcards
Elements of communicaton
- Sender
- Receiver
- Message
- Medium
- Feedback
- the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light,
Basic radio communication
- He solidify the observation of Hans Christian Oersted (electric field and magnetic field) and Andre Marie Ampere on the association of electric and magnetic.
James Clerk Maxwell
When did Maxwell demonstrated subtle connection between electric and magnetic field
1864
Maxwell solidify the observation of these two
- Hans Christian Oersted
- Andre Marie Ampere
- He supported Michael Faraday’s “a changing magnetic field produces an electric field”
Maxwell
A changing magnetic field produces
Electric field and vice versa
Maxwell incorporated ___ and ___ electromagnetism
- Light
- Wave
- The forerunner of the various carbon microphones that were used in most telephones produced in the 20th century.
David Edward Hughes
When did David Edward Hughes performed a series of experiments in which his equipment transmitted wireless signals
1879 - 1886
Hughes performed a series of experiments in which his equipment transmitted wireless signals up to
500 yards
he produced electromagnetic waves in the laboratory and their susceptibility to rasured their length and velocity.
Heinrich Rudolf Hertz
When did Heinrich Rudolf Hertz produced electromagnetic waves in the laboratory and their susceptibility to rasured their length and velocity.
1885 - 1889
- He showed that the nature of their vibration and reflection and refraction were the same as those of light and heat waves.
Heinrich Rudolf Hertz
- He experimentally demonstrated the transmission and radiation of radio frequency energy
Nikola Tesla
When did Tesla demonstrated the transmission and radiation of radio frequency energy
1802
He was also credited win being the first person to patent radio technology and when
Nikola Tesla (1943)
He proved the feasibility of radio communication
Guglielmo Marconi
he flashed the first wireless signal across the English Channel
Guglielmo Marconi
When did Guglielmo Marconi flashed the first wireless signal
1899
What letter was flashed by Guglielmo Marconi and where
Letter “S” from England to Newfoundland
- It generates data or message to be transferred.
Source
- Converts non-electrical signal into electrical form.
Input transducer
- used to send out data as radio waves in a specific band of the electromagnetic spectrum
Transmitter
